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The aim of the present study was to propose and test an experimental design enabling to synchronize simultaneously both signal-and movement-related processes in a simple sensorimotor task. Seventeen healthy volunteers were asked to flex their right wrist after the presentation of an auditory signal (tone burst of 1kHz, 200 ms duration; intersignal interval between 7–9 s). In total, 2179 collected records were divided according to the same length of the signal-movement interval into 38 time groups and the average curve for each time group was calculated. The event-related potential from all these time groups exhibited two prominent negative waves over the frontocentral region. The first one, with a mean peak latency of 110 ms, exhibited characteristics of the N1 component of cortical auditory evoked potential. Analysis of data concerning the second negative wave pointed to its dependence on both sensory and motor underlying processes. The increasing slope of the wave represented its sensory part. It started in all the time groups approximately at the same time points and was not influenced by variations of S-R interval. An estimate of its peak latency was approximately 400 ms. In time groups with S-R intervals shorter than 300 ms this N400 component was located on the time axis after the movement, i.e. when the instructed task had already been accomplished. The next portion of the second negative wave, i.e. the slow increase of amplitude to its peak value and the following decrease of the wave, exhibited a clear-cut dependence on movement.

Component N400 Can Be Demonstrated In The Event-related Potential From a Simple Auditory Reaction Time Paradigm